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From: "Arne Knutsen" <arne@aknutsen.org>
Newsgroups: comp.lang.ada
References: <20030401185038.2405d2ba.david@realityrift.com>
 <uhe9i7yy2.fsf@nasa.gov>
Subject: Re: GNAT 3.3 vs 3.15
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Date: Fri, 4 Apr 2003 12:55:26 +0200
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"Stephen Leake" <Stephen.A.Leake@nasa.gov> wrote in message
news:uhe9i7yy2.fsf@nasa.gov...
> David Holm <david@realityrift.com> writes:
>
> > What are the problems of using GNAT 3.3 over 3.15?
>
> I'm not clear what you mean by "GNAT 3.3"; there is no such thing
> according to ACT. I guess you mean "The Ada compiler that comes with
> GCC 3.3". What does "gnatmake -v" say about the version?
>
> > What is new since 3.15?
>
> Bugs. The main difference is the gcc 3.x backend; it has a lot of
> changes since the gcc 2.8 that gnat 3.15 is based on. Some of those
> changes break GNAT. To be fair, some of them improve GNAT :). ACT is
> working on fixing things, but it's a slow process.
>
> For example, the ACT candidate release of GNAT based on gcc 3.x
> (called GNAT 5.00a) is now available for customer testing; it has a
> bug that stopped me cold. They are fixing it, but I won't be using
> GNAT 5.00 (or GCC 3.3) until there is another release from ACT.

What kind of bug(s) is this. We're having trouble with a SW that runs fine
on 3.16, but fails (no crahes) on 5.0


>
> > I've been using 3.3 for a while and run it through my test suites
> > (some simple floating-point stuff) and so far have had nog problems.
>
> Then you are ok; that's what tests are for, after all!
>
> You should improve your test suite to truly test your application;
> that may make you feel more comfortable.
>
> But keep GNAT 3.15 handy; if you encounter a weird problem, try it on
> 3.15 before you blame your code :).
>
> --
> -- Stephe